PLATE I. 



KXri.ANATIoV. (See p. 2I2.) 



Water-cultures of Japanese Buckwheat, supplied with the irjfcre- 

 , Ii<-iiis of ;i \iiriintf Solution, vi/. : Sulphates, Nitrates, Phosphates and 

 chlorides of 1'otassi inn, Magnesium, Calcium and Iron, except as stated 

 below. 



I and la. Solution normal. Potassium as Chloride. 



II. Solution without Potassium. 



ll :i . Without Potassium for 4 weeks, thereafter Potassium Chloride. 



III. Potassium as Nitrate. Chlorine as in Normal. 



IV. Potassium as Sulphate. Chlorine one-fourth of Normal. 



V. Potassium as Phosphate. Chlorine one-tilth ol Normal. 



VI. Sodium but not Potassium. 



VIII. Lithium. 



IX. Without Caleinm. 



X. Without Chlorine. 



XI. Without Nitrogen. 



The meter-scale (,3'Jj* inches) serves to measure the dimensions of the 

 plants. 



